Binance holds 85% of its Bitcoin (CRYPTO: BTC) in quantum-exposed outputs, while Coinbase Global Inc. (NASDAQ:COIN) sits at 5%, according to Glassnode data analyzing which coins are vulnerable to future quantum computer attacks.
6.04M BTC Currently Quantum Exposed At Rest
Glassnode identified 6.04 million BTC, or 30.2% of issued supply, as quantum exposed. These coins are vulnerable because their public keys are already visible on the blockchain.
The threat: future quantum computers could potentially crack the private key from a known public key and steal the coins without waiting for the owner to move them.
Exposure comes from two sources. Structural exposure (1.92 million BTC, 9.6%) affects coins using older Bitcoin address types and newer Taproot addresses.
Operational exposure (4.12 million BTC, 20.6%) affects coins where owners reused addresses—once you spend …